A Night of Terror, a Lifetime of Change. The 1959 Hebgen Lake Earthquake
80 million tons of rock fell from a Montana mountainside on Aug. 17, 1959 – that’s enough fill to build a roadway from here to ….. ? Joanne Girvin, from the Quake Lake Visitor Center gives you perspective on that and more. She is joined by historian and author Larry Morris to retell the stories of tragedy and survival the night Montana was struck with a magnitude 7.5 quake. The landslide created hurricane force winds and seiches (standing waves) up to 20 feet high rolled across Hebgen Lake. It was the strongest and deadliest earthquake to ever hit Montana.
(Photo credit USGS Public Domain)